code: def test_selected_index_out_of_bounds(self):
      with self.assertRaises(TraitError):
          self.widget(self.children, selected_index=-1)
  
imports: from unittest import TestCase
  from traitlets import TraitError
  from ipywidgets.widgets import Accordion, Tab, Stack, HTML
label_desc: Use image node_id 5 for calling the TestAccordion obj's underlying member method code with example usage: obj.test_selected_index_out_of_bounds() without return types